From just the quote you provided it sounds like he's being melodramatic, but with the full comment + the post I
think he's saying you'll only get to be a good enough coder if you try to support yourself solely from your coding efforts.
Plenty of examples to counter that, although it might be true for some. Having to get good fast in order to put food on the table certainly sounds like it'd be motivating, although in a way I'd find unpleasant.